JPS6113222Y2 - - Google Patents

Description

[Detailed description of the invention] This invention aims to improve the machining accuracy of the depth of the pilot hole of the tap, the depth of threading of the tap, etc., and also improves the operability and workability of the tap holder. Regarding multi-spindle drilling machines.

In the conventional multi-spindle drilling machine for tapping,
A limit switch detects the movement stroke of the movable part to change the relative position between the workpiece and the processing tool. Therefore, in order to change the movement stroke, it is necessary to adjust the fixed position of the limit switch or the fixed position of the stopper that operates the limit switch, but it is extremely difficult to perform this adjustment with high precision. Workability is also poor.

In addition, when setting a tap, the threading depth of the tap is measured by the number of rotations of the main drive motor when the tap is rotated. This causes a difference in the thread cutting depth, resulting in an error in the thread cutting depth.

This error due to slip accumulates as the number of machining operations progresses from the time of initial setting. Therefore, even if the slip in one tapping process is extremely small, either the screw feed or the return process If slip occurs in a biased manner, it can eventually lead to a large error.

Therefore, for example, if a slip occurs during the tap return process, the thread cutting depth will go deeper than the initial setting, and in some cases, the thread will try to go deeper than the prepared hole, which can lead to accidents such as tap breakage. arise.

Such accidents can be prevented by drilling the pilot hole deep with sufficient margin, but to overcome that margin, extra machining time is required and the amount of machining required is Tool wear increases and workability declines.

The present invention improves operability and workability by eliminating the above-mentioned drawbacks, making it possible to easily set machining dimensions, and obtaining machining accuracy with less error for the set dimensions. This will be described in detail below based on the drawings of the embodiment.

FIG. 1 is a perspective view of the multi-spindle drilling machine for tapping with an elevating head according to the present invention, viewed from the right front.

A multi-axis drilling machine 1 according to the present invention includes a table 3 provided on the upper surface of a base 2 on which a workpiece is mounted,
A column 4 erected behind the table 3, a tool drive motor 5 mounted on the upper end of the column 4,
A multi-axis head 8 for mounting a tool is attached to the vertical guide surface 6 on the front side of the column 4 so as to be slidable up and down and is driven vertically by a hydraulic cylinder 7; , and a main shaft 9 rotated by the drive motor 5.

The casing 11 with the window hole 10 of the multi-axis head 8 is
A gear box 13 is provided within the casing 11 and is fixed to a carriage 12 that is guided up and down along the guide surface 6 of the column 4.

The gearbox 13 includes a plurality of branch rotating shafts 15 that transmit the rotational force of the main shaft 9 to each of the plurality of processing tools 14.

Each processing tool 14 is attached to the lower end of a spindle 16 with a mounting arm that protrudes from the lower surface of the multi-axis head 8, and the upper end of each spindle 16 is connected to each branch output shaft 15 via a universal joint 17.
is connected to.

Note that 18 is an operation panel for electrical control.

As shown in FIG. 2, linear encoders 19 are provided at important points on the column 4 to measure the vertical position of the carriage 12 on the column 4. The linear encoder 19 is a magnetic type, an electric resistance type, or
It may be any type of device that converts the length into a digital electric value, but in the embodiment, a magnetic type is used, and the magnetic scale 19a is connected to the carriage 12.
Its reading head 19b is attached to column 4.

This linear encoder 19 can measure the vertical position of the multi-axis head 8 as well as the vertical relative dimensions with respect to the workpiece.

Upper end 19c and lower end 1 of magnetic scale 19a
9d is a proximity switch 20 fixed to the column 4.
a and 20b, and the upper limit and lower limit of the multi-axis head 8 are controlled.

As shown in FIG. 3, the gearbox 13 includes:
A main shaft gear 21 fixed to the main shaft 9, a plurality of radially arranged intermediate gears 22 that mesh with the main shaft gear 21, and a branch output shaft 15 to which a driven gear 23 that meshes with each intermediate gear 22 is fixed. are housed in the bottom plate 2 of the gearbox 13.
It is supported by 4.

The upper and lower ends of the branch output shaft 15 are connected to the gear box 1.
The lower end 15a is connected to the universal joint 17, and the upper end 15 is connected to the universal joint 17.
b is connected to a rotary encoder 25 on the upper surface of the gear box 13 via gears 26 and 27 with a gear ratio of 1:1.

The rotary encoder 25 has gears 26, 2
7 is fixed to the housing 28 of the mounting housing 28.
is fixed to the housing 24 of the gear box 13. This rotary encoder 25 can measure the amount of rotation of the branch output shaft 15 with the same amount of rotation (rotation speed) with high precision.

As described above, the vertical movement stroke of the multi-axis head 8 or the position on the column 4 is determined by the linear encoder 1.
9, the amount of rotation of the tool 14 is measured with high accuracy by a rotary encoder 25, each with a digital electrical value.

When machining a pilot hole, the operating panel 18 displays values such as the ascending stop position and descending stop position of the multi-axis head 8 corresponding to the measured values of the linear encoder 19, or the machining start position and machining dimensions using the keyboard 29. Enter from.

Each machining tool 14 is attached with a different machining operation, and the machining dimensions etc. corresponding to the machining tool are input via the keyboard 29, and each machining tool 14 is selectively one is used.

In this pilot hole machining, a spindle 16a shown in FIG. 4 and a drill 14a are used as a machining tool, and the machining is controlled by a linear encoder 1.
This is done by moving the multi-axis head 8 up and down using only a value of 9.

When controlling the machining speed, it is also possible to control the descending speed of the multi-axis head 8 from the start of machining to the end of machining by counting the value of the rotary encoder 25 per unit time.

When tapping, use linear encoder 1.
From the predetermined stop position of the multi-axis head 8 corresponding to the measurement value of 9 and the stop position of the multi-axis head 8 corresponding to the measurement value of the rotary encoder 25, the dimension in which the tap advances or that dimension is determined by the rotation of the tap. A value converted into a number, etc. is input from the keyboard 29.

During this tap machining, the spindle 16b shown in FIG.
This is done at a forward rotation speed (thread cutting rotation speed) or a reverse rotation speed (extraction rotation speed) of 5.

The tap machining spindle 16b has a tap 14 on its rotating shaft 30, depending on the tap 14b used.
A threaded feed screw 31 having a thread pitch equal to the thread pitch of b is selectively used.
The thread cutting progress of the tap 4b is matched with the feeding of the tap 14b.

Since the rotary encoder 25 is directly connected to the rotating shaft 30 of the spindle 16b via the branch output shaft 15, its measured value accurately corresponds to the amount of rotation of the rotating shaft 30, and therefore ,
Thread cutting depth can be determined accurately.

As described above, according to the present invention, the linear encoder 19 not only controls accurate pilot hole drilling, but also accurately determines the initial position during tapping, and always maintains a constant position regardless of the initial and final stages of tapping. Since the thread cutting depth is accurately determined, workability, operability, and processing accuracy can be improved.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Fig. 1 is a perspective view of a multi-spindle drilling machine for tapping according to the present invention seen from the right front, and Fig. 2 is a front view showing the mounting part of the linear encoder. , Fig. 3 is a longitudinal sectional front view of the gearbox showing the mounting part of the rotary encoder, Figs. 4 and 5 show specific examples of the spindle to which the machining tool is attached, and Fig. 4 shows the spindle for a drill. FIG. 5 is a side view of the tap spindle. 1...Multi-spindle drilling machine, 2...Base, 3...Table, 4...Column, 5...Drive motor, 6...
Guide surface, 7...Hydraulic cylinder, 8...Multi-axis head, 9...Main shaft, 10...Window hole, 11...Casing, 12...Carring, 13...Gearbox, 14...Processing tool, 14a ...Drill, 1
4b...Tap, 15...Branch output shaft, 16,1
6a, 16b...Spindle, 17...Universal joint, 18...Operation panel, 19...Linear encoder, 19a...Magnetic scale, 19b
...Reading head, 19c...Top end, 19d...
...lower end, 20a, 20b...proximity switch, 21
... Main shaft gear, 22 ... Intermediate gear, 23 ...
Driven gear, 24... Bottom board, 26, 27... Gear, 25... Rotary encoder, 29... Keyboard.

Claims (1)

[Scope of utility model registration request] A sensor that can measure the relative position of the workpiece and the processing tool by converting it into an electrical value is appropriately guided to a fixing part that is integral with the member that fixes the workpiece, and the relative position of the workpiece and the processing tool is measured. A movable part to which a machining tool whose position can be changed is attached, and a fixed part that guides the movable part are provided so as to be able to measure the movement dimension of the movable part with respect to the fixed part, and a rotation speed of the machining tool is provided. A multi-spindle drilling machine for tap making, characterized in that sensors capable of measuring electrical values are provided on angular branch output shafts that are branched from the main rotating shaft and drive a plurality of machining tools, respectively.